I-90, or Interstate 90, is a major transcontinental highway in the United States. It stretches approximately 3,020 miles from Seattle, Washington in the west to Boston, Massachusetts in the east, making it the longest interstate highway in the country. I-90 passes through several states, including Idaho, Montana, South Dakota, Minnesota, Wisconsin, Illinois, Indiana, Ohio, Pennsylvania, and New York. The highway was established as part of the Eisenhower Interstate System in 1956 and serves as a vital transportation route for both commercial and personal travel. Along its route, I-90 connects major cities such as Chicago, Cleveland, and Buffalo, providing access to various attractions and landscapes, including the Rocky Mountains and the Great Lakes.